Setup DNS for AP Docker container
Docker utilizes its own way to provide DNS (hostname, hosts, NS).
By default, they are almost the same as the host's ones.
For instance, below is from AP container:
```
cat /etc/hosts
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.2 ipa.example.test ipa
cat /etc/resolv.conf
nameserver 168.63.129.16
search hqdv2iuiph0ufpcrhp4amkgzwf.fx.internal.cloudapp.net
```
As a result FreeIPA uses 168.63.129.16 (AP DNS NS [1]) as a DNS forwarder.
It's not desirable to rely on this.
Let's clear test environment.
[1] https://docs.microsoft.com/en-us/azure/virtual-network/what-is-ip-address-168-63-129-16
Related: https://pagure.io/freeipa/issue/8077
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Christian Heimes <cheimes@redhat.com>